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Aliexpress
There’re some similar (or not) items on Aliexpress
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Package Contents: 2x Massage Pad
Price history and price alert
Price history (for all/most countries) for 2x LERAVAN Snap-on Electrode Pads Black is here.
Price records source(s): Gearbest
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You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).